Combined air valve and fuel pump for internal-combustion engines



'led March 29. 1923 A. O. L.. W'ENNERBY COMBINED AIR VALVE AND FUEL PUMPFOR INTERNAL COMBUSTION ENGINES July l 1924.

5 4 0d QU w ,la 1. mv MmE/M/m @pmx @h YS S N Patented `luly 1, 1924.

UNITED STATES ARTHUR OSKAR LEONARD WENNER-BY, OF HALMSTAD, SWEDEN.

COMBINED- AIR VALVE AND FUEL PUMP FOR INTERNAL-COMBUSTION ENGINES.

Application l'ed March 29, 1923. Serial No. 628,509.

To all 'whom t may concern.'

Be it known that I, ARTHUR OsxAn LEON- ARD VVENNERBY, a citizen of theKingdom of Sweden, and residing at Halmstad, in the county of Halland,Kingdom of Sweden, have invented a new and useful Combined Air Valve andFuel Pump for Internal- Combustion Engines, of which the following is aspecification.

My invention relates to a combined air valve and fuel pump arrangementfor use in internal combustion engines provided within the hollowcylinder cover with a chamber for compressed air needed for thecombustion and for scavenging of the engine cylinder or cylinders andwherein the air valve or valves arranged within said hollow cylindercover are each placed coaxially around an inlet pipe for the -fuel andslidable lengthwise in relation thereto. The invention is characterizedsubstantially by the fact that a mechanism for controlling an air valve,which mechanism preferably but not necessarily is placed within thehollow cylinder cover, is used also for driving and controlling acorresponding fuel pump coacting with the air valve in a manner to bemore fully described below.

The invention is illustrated in the accompanying drawing, which showsthe cylinder cover forming a chamber for compressed air and the combinedair valve and fuel pump arranged therein in longitudinal section.

Referring to the drawing the numeral 1 represents the cylinder cover, afraction of which is shown in the drawing only, said cylinder coverbeing hollow and forming a chamber for compressed air, and 2 representsan oscillating lever which positively opens the air valve 3 said valvebeing carried back into its closing position by means of a spring 4. Theair valve is carried out in the shape of a sleeve slidably arrangedaround a spindle 5 fixed to the cylinder cover and forming as well atubular inlet member for the fuel entering through the fitting 6 as aplunger belonging to the fuel pump, the sleeve shaped air valve formingthe slidable cylinder of said pump. At the end of the spindle 5 facingthe engine cylinder (not shown) is arranged a fuel valve 7 the spindle 8of which extends through the cylinder cover 1 to the outside thereof andis tightened against the same by means of o. packing box 9. The valve 7is normally kept closed by means of a, spring 10 arranged outside of the.cylinder cover and acting upon the spindle 8. The outer end of saidspindle is adjustably connected with a rod 11, which through a packingbox 12 extends `into the hollow cylinder cover 1 substantially parallelwith the axis of the air valve, said rod being at the inner end, i. e.within the cylinder cover, provided with an abutment 13. Acorresponding". abutment 14 is arranged on the sleeve shaped air valve 3and the rod 11 is divided in two parts connected to each other by meansof a right and lefthand threaded sleeve nut 15, by means of which therelative distance between the abutments 13 and 14 will be adjustable.Beneath the valve 7 a valve seat 16 for a ball valve 17 is arrangedwithin the sleeve shaped air valve 3. The valve 17 `is adapted to beclosed in a direction opposite to that of the valve 7 by means of aspring and rests within a sprayer bushing 18, which is provided withoutside spiral grooves and coacts with an inlet opening 19, throughwhich the fuel is ejected against the Carburettor grate 20 and throughthe same into the engine cylinder'.

The. working of the arrangement is as follows:

When the air valve 3 is opened by means of the lever 2 at theperiodically repeated oscillations of the same a fuel chamber is formedbetween the inner end of the fixed spindle 5 and the seat 16 and whenthe abutment 14, at the opening movement of the valve 3, strikes thekabutment 14 the valve 7 is opened and the fuel is permitted to flow intothe chamber described above. During the closing movement of the airvalve 3, which movement is effected by means of the spring 4, theabutments 13 and 14 are first carried apart so that the valve 7 becomesclosed. As the valve 3 is movin further towards closing position, whicmovement takes place very rapidly, the fixed spindle 5 acts as a plungerand presses the fuel from thechamber referred to above through the valve17 to the sprayer 18 and the Carburettor. grate 20 and finally into theen ine cylinder.

t will be obvious lthat the period of time, during which the valve 7 iskept open, determines the quantity of fuel injected during each strokeof the fuel pump' and that the length of said period of time isdetermined by the distance between the abutand it will be obvious thatthe invention also with regard to described particulars may be variedwithin certain limits, since the main feature is only the coactionbetween the valves 3 and 7 effected by means of the abutments 13 and 14.

If desired, the nut 15 may be provided with a lever 21, which may beconnected with a. governor driven by the combustion engine for thepurpose of automatically controllingl the quantity of fuel injected andfor maintaining a substantially constant speed of the engine atdifferent loads on the same.

The manner of and arrangements used for the opening and closing of theair valve 3 are without influence upon the invention and may be effectedin many different ways. The controlling mechanism for said valve needsnot necessarily be located within the hollow cylinder cover, but. thevalve may as well be extended outside of the same and the control may beeffected by suitable outside means. Further it is not necessary to use asleeve nut or the like for shortening and lengthening the rod l1 andthereby for controlling the quantity of fuel injected, since othermechanical means acting in the same manner may also be used for the samepurpose and the main point is that such means shall be able to vary thedistance between the abutments 13 and 14: only. The spraying arrangement18, 19 and the carburettor grate 20 may also be carried out in variousmodifications without iniuence upon the invention. Thus the invention isnot limited to the embodiment thereof shown in the accompanying drawing.

l. Combined air valve and fuel pump arrangement for internal combustionengines having a hollow cylinder cover forming a chamber for compressedair, comprising for each cylinder of the engine a fuel inlet pipe fixedwithin the hollow cylinder cover, a sleeve shaped air valve arrangedcoaxially around said fuel pipe slidably lengthwise in relation theretoand thereby acting as a fuel pump, means for opening and closing saidair valve in correct timing with regard to the strokes of the engine, afuel valve provided at the inner end of the fuel inlet pipe facing theengine cylinder and controlling means interposed between the fuel valveand the air valve so that the former is controlled in correct timing inrelation to the latter.

2. Combined air valve and fuel pump arrangement for internal comb-ustionengines having a hollow cylinder cover forming an air chamber,comprising for each cylinder of the engine a fuel inlet pipe fixedwithin the hollow cylinder cover, a sleeve shaped air valve arrangedcoaxially around said fuel pipe slidably lengthwise in relation theretoand thereby acting as a fuel pump, said air valve being combined withsuitable means for opening and closing of the same in correct timingwith regard t-o the strokes of the engine, a fuel valve provided at theinner end of the fuel inlet pipe facing the engine cylinder and normallyclosing said inlet pipe, controlling means combined with the air valveand positively coacting with corresponding controlling means combinedwith the fuel valve in such a manner that the latter is opened by theformer near the end of its opening movement and that the fuel valve isclosed during the beginning of the closing movement of the air valve andkept closed during the latter part of the same.

3. Combined air valve and fuel pump arrangement for internal combustionengines having a hollow cylinder cover forming an air chamber,comprising for each cylinder of the engine a fuel inlet pipe fixedwithin the hollow cylinder cover, a sleeve shaped air valve arrangedcoaxially around said fuel pipe slidably lengthwise in relation theretoand thereby acting as a fuel pump, said air valve being combined withsuitable means for opening and closing the same in correct timing withregard to the strokes of the engine, a fuel valve provided at the innerend of the fuel inlet pipe facing the engine cylinder and normallyclosing said inlet pipe, a spindle connected with said fuel valve andextending outside of the cylinder cover, a rod aiiixed to said fuelvalve spindle and intruding into the cylinder cover substantiallyparallel to the axis of the air valve, an abutment affixed to the innerend of said rod inside of the hollow cylinder cover and another abutmentafxed to the air valve and coacting with the first mentioned abutmentfor opening the fuel valve in correct timing in relation to the airvalve.

4. Combined air valve and fuel pump arrangement for internal combustionengines having a hollow cylinder cover forming an air chamber,comprising for each cylinder of the engine a fuel inlet pipe fixedwithin the hollow cylinder cover, a sleeve shaped air valve arrangedcoaxially around said fuel pipe slidably lengthwise in relation theretoand thereby acting as a fuel pump, means for opening and closing saidair valve in correct timing with regard to the strokes of the engine, afuel valve provided at the inner end of the fuel inlet pipe facing theengine cylinder, a second fuel valve arranged within the hollow airvalve nearer to the engine cylinder than the first mentioned fuel valveand opening in the opposite direction, and controlling means interposedbetween the said first mentioned fuel valve and the air valve forcontrolling the former in correct timing in relation to the latter.

5. Combined air valve and fuel pump arrangement for internal combustionengines having a hollow cylinder cover forming an air chamber,comprising for each engine cylinder a fuel inlet pipe fixed within thehollow cylinder cover, a sleeve shaped air valve arranged coaxiallyaround said fuel pipe slidably lengthwise in relation thereto andthereby acting as a fuel pump, means for opening and closing said airvalve in correct timing with regard to the strokes of the engine, a fuelvalve provided at the inner end of the fuel inlet pipe facing the enginecylinder and normally closing said inlet pipe, a spindle connected withsaid fuel valve and extending outside of the cylinder cover, a rodadjustably affixed to said fuel valve spindle and intruding into thecylinder cover substantially parallel to the axis of the air valve, saidrod being divided in parts,y which are adjustable lengthwise in relationto each other, an abutment arranged on the inner end of said rod insidethe hollow cylinder cover, and another abutment arranged on the sleeveof the air valve and coacting with the iirstmentioned abutment forcontrolling the fuel valve in correct tim-` ing in relation to the airvalve.

6. Combined air valve and fuel pump arrangement for internal combustionengines having a hollow cylinder cover forming an air chamber,comprising for each cylinder of the engine a fuel inlet pipe fixedwithin the hollow cylinder cover, a sleeve shaped air valve arrangedcoaxilly around said fuel pipe slidably lengthwise in relation theretoand thereby acting as a fuel pump, controlling means arranged within thehollow cylinder cover for the purpose of opening and closing the airvalve incorrect timing with regard to the strokes of the engine, a fuelvalve provided at the inner end of the fuel inlet pipe facing the enginecylinder, a second fuel valve arranged within the sleeve shaped airvalve nearer to the engine cylinder than the firstmentioned fuel valveand opening in the opposite direction, a spindle connected with thefirst mentioned fuel valve and extending outside of the cylinder cover,a rod adjustably affixed to said spindle and intruding within the hollowcylinder cover substantiallyl parallel to the axis of the air valve,said rod being divided in two parts, which are adjustable lengthwise inrelation to each other, an abutment arranged on the inner end of saidrod inside the hollow cylinder cover, and another abutment arranged onthe sleeve of the air valve and coacting with the firstmentionedabutment for controllin lirstmentioned fuel valve incorrect timing inrelation to the air valve.

In testimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses.

ARTHUR OS-KAR LEONARD WENNERBY.

Witnesses G. Pn'rnRssoN, ERIC ERIosoN.

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